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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.